The object of the present invention is to improve the thermal properties while maintaining the optical performance index. In the constitution having the light-permeable first dielectric layer, magneto-optical recording layer, light-permeable metal layer 1 nm to 10 nm in thickness and having layer heat diffusion as compared with the magneto-optical recording layer, light-permeable second dielectric layer, and metal reflecting film laminated sequentially from the light incidence side, an appropriate Kerr enhancement effect is obtained, the optical performance index is maintained, and temperature rise can be suppressed.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A magneto-optical recording medium, comprising: a light-permeable first dielectric layer; a magneto-optical recording layer disposed against the light-permeable first dielectric layer; a light-permeable metal layer of 1 nm to 10 nm in thickness disposed against the magneto-optical recording layer and having larger heat diffusion as compared with the magneto-optical recording layer; a light-permeable second dielectric layer disposed against the light-permeable metal layer; and a metal reflecting layer disposed against the light-permeable second dielectric layer.
2. The magneto-optical recording medium of claim 1 , wherein the light-permeable metal layer is made of Au or Cu.
3. The magneto-optical recording medium of claim 1 , wherein the light-permeable metal layer is made of Al or Ag.
4. A method of manufacturing a magneto-optical recording medium, comprising: sequentially forming on a light-permeable base material, a light-permeable first dielectric layer, a magneto-optical recording layer, and a light-permeable metal layer of 1 nm to 10 m in thickness and having larger heat diffusion as compared with the magneto-optical recording layer; smoothing a surface of the light-permeable metal layer; and forming a light-permeable second dielectric layer on the light-permeable metal layer and a metal reflecting layer on the light-permeable second dielectric layer, wherein the magneto-optical recording medium is configured to receive light against the metal reflecting layer from the light-permeable base material.
5. A method of manufacturing a magneto-optical recording medium, comprising: forming a metal reflecting layer, a light-permeable second dielectric layer, and a light-permeable metal layer sequentially on a base material; smoothing a surface of the light-permeable metal layer; and forming a magneto-optical recording layer on the light-permeable metal layer and a light-permeable first dielectric layer on the magneto-optical recording layer, wherein the light-permeable metal layer is made of a metal film of 1 nm to 10 nm in thickness and having larger heat diffusion as compared with the magneto-optical recording layer, and wherein the metal reflecting layer is configured to block light from the light-permeable base material.
6. The method of manufacturing a magneto-optical recording medium of claim 4 , wherein each layer is formed by sputtering, and smoothing the surface of the light-permeable metal layer comprises reverse sputter.
7. The method of manufacturing a magneto-optical recording medium of claim 5 , wherein each layer is formed by sputtering, and said surface smoothing the surface of the light-permeable metal layer comprises reverse sputtering.
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February 2, 2000
September 17, 2002
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